Drill-chuck.



Patented Sept. l6, I902. A. J. STUDNICKA.

DR'ILL CHUCK.

(Application filed Mar. 20, 1902.)

2 Sheets-Shegt I.

mf/ieaca J48). JIf/M/ No. 709,06|. Patented Sept. [6, I902.

A. J. STUDNICKA.

DRILL CHUCK.

(Application filed Mar. 20, 1962.)

(No Model.) 2 Sheeis-8heet 'z.

wl/ fltifi 1/13 M 1 Jag/7.163120% w 2y 2("517/257/(4; LL 4 v UNITED STATES PATENT OFFICE.

ALBERT J. STUDNICKA, OF MINNEAPOLIS, MINNESOTA.

DRILL-CHUCK.

SPECIFICATION forming part of Letters Patent No. 709,061,- dated September 16, 1902.

Application filed March 20, 1902. Serial No. 99,080. (No model.)

To all whom it may concern.-

Be it known that I, ALBERT J. STUDNICKA, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Drill-Chucks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide an improved drill-chuck; and to this end it consists of the novel devices and combinations of devices hereinafter described, and defined in the claims.

The invention is illustrated in the accom panying drawings,wherein like characters indicate like parts throughout the several views.

Figure 1 is a View principally in section, but with some parts shown in full, taken centrally through a chuck embodying the several features of my invention. Fig. 2 is a transverse section on the line 00 m of Fig. 1. Fig. 3 is a detail view in section on the line 00 00 of Fig. 1. Fig. 4: is a detail view in side elevation showing the chuck-jaws removed from working position and drawn apart. Fig. 5 is a section on the line as m of Fig. 4; and Figs. 6 and 7 are detail views of the chuck-head, respectively in side and end elevation.

The numeral 1 indicates the head of the chuck, which, as is ordinary, is provided with an axial socket 2, adapted to receive the tapered spindle 3 of the drill-press. On its eX- terior cylindrical surface the head 1 is provided with screw-threads 4, and on its front face it is provided with a pair of laterallyspaced cheek-pieces or lugs 5. These cheekpieces taper outward, and their exterior surfaces form parts of the same cone. The innor and opposing faces of the said cheekpieces are flat and parallel, and the adjacent end of the head 1 between the same is flat and smooth, so as to afiord an abutting surface 6 for the jaws of the chuck. A clamping-collar 7 workswith screw-threaded engagement on the threads 4: of the head 1 and forms a housing for the chuck-jaw, as will presently be noted. At its projecting end the clamping-collar 7 is provided with a contracted flange 8, having a conical perforation chuck-jaws.

9, which engages the conical surfaces of the As shown, the collar 7 is provided with peripheral seats 10, into which the pin of a pin-wrench may be inserted to tighten the said clamping-collar with great force.

The chuck-jaws 11 are formed with interlapping and reversely-beveled drill-engaging teeth 12, which are made to fit with a slight play or clearance and which are adapted to engage the drilla in the ordinary manner. These jaws 11 have parallel sides and fit loosely between the parallel faces of the cheek-pieces 5 of the chuck-head 1. Their outer portions are made conical and taper outward, as indicated at 13. These beveled surfaces 13 engage with the conical perforations in the flange 8 of the clamping-collar 7, so that when the said collar is screwed inward and onto the head 1 the said jaws are forced together and onto the shank of the drill. The inner extremities of the jaws 11 are slightly rounded, as indicated at 14., and are adapted for engagement with the abutting surface 6 of the head 1. Each jaw 11 is shown as provided with a projecting guide-finger 15, which engages a groove 16 in the other jaw. The said guide-fingers 15 fit quite loosely within said groove 16, so as to allow the jaws 11 to rock slightly for proper engagement with the slightly-tapered drillshank. The jaws are automatically thrown apart by a pair of loose springs 17, loosely secured thereto by screws 18. The springs 17 embrace the opposite faces of the jaws; 11- that is, extend in different arcs of a circle and tend to impart straight movements to the said jaws, whereas a single spring would tend to move the said jaws on an arc of a circle and to cause the jaws to buckle laterally when removed from between the checks 5. In view of the fact that the rear ends of the jaws 11 work against a flat abutting surface it is possible for the said jaws to rock slightly, so as to closely engage a slightly -tapered drillshank. The engagement between the conical surface of the jaws and the conical seat tends to keep the teeth of the said jaws in parallel alinement but such engagement may be overcome, as above stated, whenever the jaws are clamped onto a tapered drill-shank. This is an action very desirable in drillchucks. In the drawings the inner ends of the jaws 11 are shown as rounded or curved more than would be necessary in practice. With the construction above described it is evident that the jaws 11 are free to slide on the abutting surface 6 and between the checks 5 and are properly centered by the tapered or conical seat in the flange of the clamping-collar.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

1. In a drill-chuck, the combination with the head 1 screw-threaded at and provided with the integrally-formed cheek-pieces 5 and the abutting surface 6, which cheek-pieces 5 are spaced inward from said threads and are tapered at their outer ends, of the jaws 11 tapered at their outer ends and Working between said cheek-pieces with their inner ends abutting against said abutting surface, the clamping-collar 7 engaging the screw-threads 4 of said head, spaced apart from said checkpieces to form an annular space and provided -at its outer end with the conical seat 9 engaging the tapered ends of said jaws, and a spring extended circumferentially in said annular space and connected to both of said jaws and tending to separate the same, substantially as described.

2. In a drill-chuck, the combination with the head 1 having integrally-formed cheekpieces 5 abutting the surface 6, of the jaws ll tapered at their outer ends and working freely between said cheek-pieces with their inner ends abutting against said abutting surface, the pair of springs 17 embracing the opposite cheek-pieces 5 and attached at their ends to the said pair of jaws and tending to separate the same with a straight-line force, and a clamping-collar 7 screw-threaded onto said head 1 and provided at its outer end with the flange 8 having the conical seat 9 engaging the tapered ends of said jaws, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERT J. STUDNIOKA.

Witnesses:

E. F. WILLIAMSON, F. D. MERCHANT. 

